<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        #div1{
            background-color: darkcyan;
            width: 300px;
            height: 350px;
            border: 1px solid red;
        }
        #div2{
            background-color: #8bc34a;
            width: 200px;
            height: 100px;
            margin: 50px;
        }
        #div3{
            background-color: aqua;
            width: 200px;
            height: 100px;
            margin: 50px;
        }
    </style>
</head>
<body>

<div id="div1">
    <div id="div2"></div>
    <div id="div3"></div>
</div>

</body>
</html>